... Thanks Dave. I am at the stage where it is difficult to call things. I am more interested in getting other chips to shut up so I can test them one chip at...
Declan Moriarty
tech.genius@...
Jul 1, 2004 8:17 am
6285
... Guarding is shielding with a shield which is actively hold on an appropriate voltage. When you have a small differential signal (p.e. EEG) with a high...
H.C. Croon
h.c.croon@...
Jul 1, 2004 3:22 pm
6286
Hi list, I know this is not a chip-related question, but it's semiconductors, so it's at least half on-topic. I'm repairing my Hameg HM604 oscilloscope, it's...
Jens Schönfeld
jens@...
Jul 1, 2004 7:17 pm
6287
... You're right Harry, That's not what I was talking about at all. The term is also used in board testing, when one is finding faults at component level. If...
Declan Moriarty
tech.genius@...
Jul 1, 2004 7:51 pm
6288
... According to my databook, the pinout is C E B reading from left to right in your photo. Very unusual to find the centre pin as emitter! 25V Vce, 40 mA,...
Declan Moriarty
tech.genius@...
Jul 1, 2004 8:00 pm
6289
Datasheet at a paid service: http://www.s-direktnet.de/homepages/sangmeister/daten/halbl/tbf.htm It is a normal NPN part. Why not replave it with one you can...
Pieter Hoeben
info@...
Jul 1, 2004 8:11 pm
6290
My databook suggests BF199 or BF224 as pin-for-pin replacements for the '311. The blue dot most probably is a hfe group. In former times, some manufacturers...
Steffen Maisch
steffen.m@...
Jul 1, 2004 10:26 pm
6291
High Jens, I haven't found a trace of BF311 in my database, numbers start with BF316. Regarding the blue paint, all I can tell you is, that I have some old...
Friedel Bruening
bolinst@...
Jul 1, 2004 10:27 pm
6292
... OK, that a signification which is new to me. ... With the exception of open collector drivers TTL has totem pole outputs, so it sinks as well as sources...
H.C. Croon
h.c.croon@...
Jul 1, 2004 10:42 pm
6293
... I have the HM605 with schematic. Perhaps there is some similarity. As for the BF311, now your received 2 different pinouts: Declan's and Pieter's. Pieter's...
H.C. Croon
h.c.croon@...
Jul 1, 2004 10:42 pm
6294
... Jens, you are asking me to recall some pretty old brain cells. Color marking was used for a number of functions. As I recall these transistors were sold...
Fred Townsend
fred@...
Jul 2, 2004 12:56 am
6295
... Oh I see. But the high drive is surely limited in some way - there's no current behind it. ... I went away. I have to keep work flowing through, with or...
Declan Moriarty
tech.genius@...
Jul 2, 2004 8:52 am
6296
... It might be a similar circuit, but I haven't found ay PNP transistors in that area yet. Exchanging T606 helped a bit, I can now adjust intensity to a spot...
Jens Schönfeld
jens@...
Jul 2, 2004 11:19 am
6297
JS> It might be a similar circuit, but I haven't found ay PNP transistors in JS> that area yet. Exchanging T606 helped a bit, I can now adjust intensity to JS>...
Uwe Zimmermann
uwezi@...
Jul 2, 2004 11:41 am
6298
Declan, I don't know what you're reading but I think you are thorooughly confused. You should not have to guard the inputs to TTL logic. They require enough...
Joe R.
rigdonj@...
Jul 2, 2004 1:03 pm
6299
Since the pinout of the device seems to be in question, I will offer the following tip: Identification of the Base pin is not a problem as it will show...
Bob Smith
bobsmith5@...
Jul 2, 2004 2:01 pm
6300
... That odd, in my schematic there are plenty of PNP's (BF423, BF440, BC557). ... I will contact you at jens@.... ... Jens Schönfield ... -- Author: H.C....
H.C. Croon
h.c.croon@...
Jul 2, 2004 2:18 pm
6301
Hi Joe, Your reply is so full of misunderstanding that I can not resist the temptation to answer, although it is Declan's affair. ... In my opinion you are...
H.C. Croon
h.c.croon@...
Jul 2, 2004 3:01 pm
6302
Hi anybody, I need urgently to buy 2 ea. TLX1781-C3B. Searching quite a bit I have found only 1 distributor who sais he has, but still haven't got any quote or...
Friedel Bruening
bolinst@...
Jul 3, 2004 2:48 pm
6303
If you want in circuit device testing, look into designing with JTAG. Bob White ... To: "Multiple recipients of list CHIPDIR-L" <CHIPDIR-L@...> Sent:...
Bob White
bob@...
Jul 3, 2004 3:21 pm
6304
... If you read the previous comments, you may have realised I am repairing, not designing. I don't believe JTAG is much use as a repair technique, especially...
Declan Moriarty
tech.genius@...
Jul 3, 2004 7:56 pm
6305
... You're probably right. I can't make any sense of what he's trying to do. OK I'll shut up and go away. Joe -- Author: Joe R. INET: rigdonj@... Fat...
Joe R.
rigdonj@...
Jul 3, 2004 9:46 pm
6306
ganswijk@...
Jul 4, 2004 4:47 am
6307
Hello Jens: Can you send me this HM605 manual by this way, please? Thank in advanced Oscar Garcia Cali Colombia electrofe@... ... To: "Multiple...
Ing. Oscar Garcìa ...
electrofe@...
Jul 5, 2004 5:08 am
6308
Hey Group, Does anybody have any info on a Toshiba TC9538N I.C. Toshiba said it's a discontinued no-go. It's a 42 pin wide dip and I am thinking it's a micro...
Tim Johnson
ifixaudio@...
Jul 7, 2004 4:27 pm
6309
I currently have a p133 based pc on a card (as used in Industrial pcs). It doesn't boot, although the power supply comes up and is good. It will boot after a...
Declan Moriarty
tech.genius@...
Jul 7, 2004 4:34 pm
6310
... The semiconductors with the most "aging problems" I have ever seen is memory - any kind of memory, be it roms, flash, D-Ram, S-Ram etc. If POST doesnt...
Jens Schönfeld
jens@...
Jul 7, 2004 5:01 pm
6311
Hi, ... any kind of memory, be it roms, flash, D-Ram, S-Ram etc. If POST doesnt work, check the BIOS rom. In my experience, CONTACTS are often the problem. And...
Pieter Hoeben
info@...
Jul 7, 2004 7:42 pm
6312
Please, offer with date codes: ITEM PART N:O QTY 1. AMD:A1100...
Harri Pykäläi...
harri.pykalainen@...
Jul 7, 2004 8:22 pm
6313
... Selling only two chips of a certain kind is almost always much to expensive for a distributor (let alone a broker) and most will not bother to reply if...
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